3GPP Glossary

Hybrid Automatic Repeat reQuest

A retransmission mechanism combining forward error correction with ARQ, using soft-combining of failed and retransmitted data.

Medium Access Control

The Layer 2 sublayer responsible for scheduling, HARQ, and multiplexing of logical channels onto transport channels.

Packet Data Convergence Protocol

The Layer 2 sublayer providing header compression, ciphering, integrity protection, and in-order delivery for user and control plane data.

Radio Bearer

A logical connection between the UE and the network providing a defined QoS treatment for either signaling (SRB) or user data (DRB).

Radio Link Control

The Layer 2 sublayer providing segmentation, ARQ retransmission, and in-sequence delivery between MAC and PDCP.

Radio Resource Control

The Layer 3 protocol that manages connection establishment, mobility, and configuration of the radio interface between the UE and the network.